java中使用JDBC运用ORACLE完成增删改查的实现

向数据库中插入一条数据

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class InsertDemo {
    public static void main(String[] args) {
        String className = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@localhost:1521:king";
        String user = "scott";
        String password = "sa";
        String user_name = "scott";
        String user_password = "sa";
        String sql = "insert into userinfo(id,user_name,user_password,create_date) values (sq_userinfo2_id.nextval,'"
                + user_name + "','" + user_password + "',sysdate)";
        try {
            Class.forName(className);
            Connection connection = DriverManager.getConnection(url, user,
                    password);
            Statement statement = connection.createStatement();
            statement.executeUpdate(sql);
            System.out.println("录入成功");
        } catch (Exception e) {
            System.out.println("录入失败");
            e.printStackTrace();
        }
    }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class SelectDemo {
    public static void main(String[] args) {
        String className = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@localhost:1521:king";
        String user = "scott";
        String password = "sa";
        int id = 3;
        String sql = "select * from userinfo where id=" + id + "";
        try {
            Class.forName(className);
            Connection connection = DriverManager.getConnection(url, user,
                    password);
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery(sql);
            while (resultSet.next()) {
                System.out.println(resultSet.getString("user_name"));
            }
            System.out.println("查询成功");
        } catch (Exception e) {
            System.out.println("查询失败");
            e.printStackTrace();
        }
    }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class UpdateDemo {
    public static void main(String[] args) {
        String className = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@localhost:1521:king";
        String user = "scott";
        String password = "sa";
        int id = 3;
        String temp_user_name = "arthur";
        String sql = "update userinfo set user_name= '" + temp_user_name
                + "' where id=" + id + "";
        try {
            Class.forName(className);
            Connection connection = DriverManager.getConnection(url, user,
                    password);
            Statement statement = connection.createStatement();
            statement.executeUpdate(sql);
            System.out.println("更新成功");
        } catch (Exception e) {
            System.out.println("更新失败");
            e.printStackTrace();
        }
    }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class DeleteDemo {
    public static void main(String[] args) {
        String className = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@localhost:1521:king";
        String user = "scott";
        String password = "sa";
        int id = 3;
        String sql = "delete from userinfo where id=" + id + "";
        try {
            Class.forName(className);
            Connection connection = DriverManager.getConnection(url, user,
                    password);
            Statement statement = connection.createStatement();
            statement.executeUpdate(sql);
            System.out.println("删除成功");
        } catch (Exception e) {
            System.out.println("删除失败");
            e.printStackTrace();
        }
    }
}